From: | Stephen Frost <sfrost(at)snowman(dot)net> |
---|---|
To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, PgHacker <pgsql-hackers(at)postgresql(dot)org>, Shigeru Hanada <shigeru(dot)hanada(at)gmail(dot)com>, Jim Mlodgenski <jimmy76(at)gmail(dot)com>, Peter Eisentraut <peter_e(at)gmx(dot)net>, Kohei KaiGai <kaigai(at)kaigai(dot)gr(dot)jp> |
Subject: | Re: [v9.5] Custom Plan API |
Date: | 2014-05-09 02:16:24 |
Message-ID: | 20140509021624.GF2556@tamriel.snowman.net |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
* Robert Haas (robertmhaas(at)gmail(dot)com) wrote:
> Well, I consider that somewhat good news, because I think it would be
> rather nice if we could get by with solving one problem at a time, and
> if the executor part is close to being well-solved, excellent.
Sadly, I'm afraid the news really isn't all that good in the end..
> My ignorance is probably showing here, but I guess I don't understand
> why it's so hard to deal with the planner side of things. My
> perhaps-naive impression is that a Seq Scan node, or even an Index
> Scan node, is not all that complicated. If we just want to inject
> some more things that behave a lot like those into various baserels, I
> guess I don't understand why that's especially hard.
That's not what is being asked for here though...
> Now I do understand that part of what KaiGai wants to do here is
> inject custom scan paths as additional paths for *joinrels*. And I
> can see why that would be somewhat more complicated. But I also don't
> see why that's got to be part of the initial commit.
I'd say it's more than "part" of what the goal is here- it's more or
less what everything boils down to. Oh, plus being able to replace
aggregates with a GPU-based operation instead, but that's no trivially
done thing either really (if it is, let's get it done for FDWs
already...).
Thanks,
Stephen
From | Date | Subject | |
---|---|---|---|
Next Message | Stephen Frost | 2014-05-09 02:18:46 | Re: [v9.5] Custom Plan API |
Previous Message | Stephen Frost | 2014-05-09 02:13:23 | Re: [v9.5] Custom Plan API |